Luxurious hallway complete with open beams, stable doors and a Welsh slate fireplace complete with Royal crest

Giveaways as to the identity of the owners of the Welsh property are scattered throughout the home, including the eco washing powder on the kitchen draining board and the carbon-friendly heating system.

The decor is austere - no frills with bare floors, traditional Welsh weavings on the walls and local pottery on the dresser.

There is no TV or DVD player in sight in the main house - instead there are ample books on local folklore and guides to local walks across the rolling countryside.

Royal farmhouse: It will be rented out when Charles is not in residence

And while there's no royal garden, the property has its own 192-acre organic farm.

Builders currently renovating the home have used sustainable products for the makeover and Camilla chose the colour scheme of duck egg blue, off whites and terracotta.

But above the fireplace is the biggest clue of all - the three feathers crest of the Prince of Wales carved into Welsh slate.

The biggest clue to the identity of the owners of the house is the three feathers crest of the Prince of Wales carved into Welsh slate above the huge fireplace

Charles and Camilla spent their first night at their new home, a £1.2million converted farmhouse on the Llwynywermod Estate near the village of Myddfai, Carmarthenshire, on Monday.

And they gave a local photographer a royal preview of the tasteful interior, including the couple's bedroom and en suite bathroom.

Grand: The guesthouse restoration is scheduled to finish next January

Myfanwy Shorey, an interior designer based in Cardiff, said: 'This is no Footballer's Wives pad or grand palace - it is a simple, tasteful and elegant design completely in fitting with its surroundings.

'There has obviously been much regard and concern gone into the fittings - local pottery, well-designed classic Welsh furniture and homely wall-hangings.

His 'n' hers: Twin beds in the main bedroom

'It is all beautifully understated but with the occasional nod to the couple's royal standing in the artwork - although I would have liked to have seen more Welsh art on the walls.

'To some eyes it may be a little austere, but it works exceptionally well in its surroundings.

The three-bedroomed house will be available to rent once renovation work has been completed early next year

Duchy of Cornwall land steward David Curtis said: 'The property when we came here consisted of just a farmhouse, a courtyard of traditional farm buildings and a number of modern buildings.

'It took last spring and summer to work out the plans and get planning consent. We started work in August and we were still here working yesterday. And there are still things left to be done.

'They (Charles and Camilla) have had a tremendous amount of input. They have been updated weekly on the progress of the property and its design.

'They got written reports and photographs and chose the colours on the walls inside and out, as well as many of the details of the furniture.'

Asked why the Prince chose this as his Welsh residence, Mr Curtis said: 'It is historic parkland, it is secluded, peaceful, has a lovely range of farm buildings, it ticked most of the boxes, basically.